<template>
  <div class="row">
    <div class="col-4 mb-4" v-for="(item,index) in columnList" :key="index">
      <div class="card h-100 shadow-sm">
        <div class="card-body text-center">
          <img class="rounded-circle border border-light w-25 my-3" :src="item.avatar">
          <h5 class="card-title">{{ item.title }}</h5>
          <p class="card-text text-left">{{ item.description }}</p>
          <a href="#" class="btn btn-outline-primary">进入专栏</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script lang='ts'>
import { computed, defineComponent, PropType } from 'vue'
export interface ColumnProps {
  id: number;
  title: string;
  avatar?: string;
  description: string;
}

export default defineComponent({
  name: 'ColumnList',
  props: {
    list:{
      type: Array as PropType < ColumnProps[] >,
      required: true
    }
  },

  setup(props){
    const columnList = computed(()=>{
      return props.list.map(column => {
        if(!column.avatar) {
          column.avatar = require('@/assets/aaa.jpg')
        }
        return column
      })
    })
    return {
      columnList
    }
  }
})
</script>

<style>

</style>